Sore boobs

Von • 20 , Mother of Darion born 3/13/16 Expecting baby girl 2/1/18
I've been having sore boobs for about a week in an half there in pain when you rub against. My next period isn't expected until feb 21st my last period was Han 20-26 I've been having unproved sex  a lot just wondering if this is normal with my boobs being this sore